JP2017065439A - Vehicle body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle body structure which properly transmits a load applied to a sub frame during a vehicle collision to a side frame.SOLUTION: In a vehicle body structure including a side frame 10 and a sub frame 50, a side member 30 of the sub frame 50 has a high rigidity part 31 having relatively high rigidity and a truss part 32 disposed behind the high rigidity part 31. The truss part 32 has an upper side inclination part 33 extending to an oblique upper side and connected with a cross member 20; and a lower side inclination part 34 extending to an oblique lower side. The side member 30 has: a side frame attachment part disposed at a front side relative to the high rigidity part 31; and a cross member attachment part used for attachment to the cross member 20 formed at the truss part 32.SELECTED DRAWING: Figure 1

Description

  The present invention includes a vehicle body structure including a pair of left and right side frames extending in the front-rear direction, a cross member extending in the left-right direction below each side frame, and a subframe extending in the front-rear direction below the cross member. About.

  As this type of vehicle structure, the vicinity of the rear end of the front range of the subframe is coupled and supported to the side frame via the subframe support, and the rear surface of the sideframe support is shifted from the subframe to the sideframe. There is known one that extends at an angle so as to be rearward (for example, Patent Document 1). In this vehicle body structure, the impact load input to the front end of the subframe is thereby transmitted along the inclined rear surface portion of the subframe support portion and is transmitted to the side frame.

JP 2001-30754 A

  However, even in the vehicle body structure described in Patent Document 1, when a load is applied from the front in the event of a vehicle collision or the like, if the connecting portion of the subframe and the side member is deformed, the load applied to the subframe is accurately transmitted to the subframe. It may not be possible.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle body structure that can accurately transmit a load applied to a subframe at the time of a vehicle collision to a side frame.

  To achieve the above object, according to the present invention, a pair of left and right side frames extending in the front-rear direction, a cross member connected to a lower portion of each side frame and extending in the left-right direction, and the side frames and the cross members A sub-frame having a pair of side members disposed below and extending in the front-rear direction. The side members are disposed at the rear of the energy absorbing portion and are relatively rigid, and are disposed at the rear of the energy absorbing portion. A high-rigidity portion and a truss portion disposed behind the high-rigidity portion, the truss portion extending obliquely upward from a predetermined division position toward the rear and connected to the cross member An inclined portion, a lower inclined portion extending obliquely downward from the dividing position toward the rear, and the upper inclined portion and the lower inclined portion behind the dividing position. A rear connecting portion that continues, and the side member is further formed on the truss portion and a side frame mounting portion for mounting on the side frame disposed in front of the high-rigidity portion. There is provided a vehicle body structure having a cross member mounting portion for mounting to the cross member.

  According to this vehicle body structure, by providing the high-rigidity portion and the truss portion, the rigidity of the connection portion of the side member of the subframe with the cross member and the vicinity of its front side is improved. Thereby, even when a load is applied from the front in the event of a vehicle collision and the front energy absorbing portion is crushed, deformation of the side member connected to the cross member and the vicinity of the front portion is suppressed. Since the upper inclined portion of the truss portion extends obliquely upward from the dividing position toward the cross member, the load applied to the subframe from the front is reliably applied to the cross member and the side frame via the upper inclined portion. Can communicate.

  The said vehicle body structure WHEREIN: The said side member may have a low-rigidity part arrange | positioned ahead of the said high-rigidity part and comparatively low rigidity.

  According to this vehicle body structure, the amount of energy absorbed at the initial stage of the vehicle collision can be increased by positively deforming the low-rigidity part at the initial stage of the vehicle collision. Further, by buckling the side member at the low rigidity portion at the initial stage of the vehicle collision, the connection portion of the side member with the cross member and the posture in the vicinity of the front portion can be maintained. Therefore, even after the energy absorbing portion of the side member is deformed in the initial stage of the vehicle collision, the load applied from the front to the sub frame can be continuously transmitted to the cross member and the side frame via the upper inclined portion.

  In the vehicle body structure, the side member includes a substantially horizontal front horizontal portion, an intermediate inclined portion extending obliquely downward toward the rear, and a substantially horizontal rear horizontal portion, which are successively formed from the front side. A frame main body, wherein the low-rigidity portion is disposed at a boundary portion between the front horizontal portion and the intermediate inclined portion in the frame main body, and the lower divided portion is a part of the intermediate inclined portion of the frame main body May be made.

  According to this vehicle body structure, even in the case of a subframe in which the front and rear center of the frame body of the side member is inclined, it can be buckled at the boundary between the front horizontal portion and the intermediate inclined portion at the time of a vehicle collision, Mode can be controlled.

  In the vehicle body structure, the side frame attaching portion of the side member may be disposed near the front end of the side member.

  According to this vehicle body structure, the vicinity of the front end of the side member is accurately supported, and the load applied to the side member in the initial stage of the vehicle collision is transmitted to the rear side of the side frame. Energy absorption.

  In the vehicle body structure, the side member includes, in plan view, a front side front-rear extension portion extending in the front-rear direction, a slanted extension portion extending rearward and leftward and rearward, and a rear side front-rear extension portion extending in the front-rear direction. And a frame main body continuously formed in order from the front side, and the side frame attachment portion of the side member may be disposed in the front side front-rear extension portion.

  According to this vehicle body structure, since the side frame attachment portion is disposed in the front side front and rear extension portion, a load is applied directly from the side frame attachment portion to the relatively weak oblique extension portion in the event of a vehicle collision. There is no.

  In the vehicle body structure, the high rigidity portion of the sub frame may be a tie-down hook.

  According to this vehicle body structure, the tie-down hook can be used as a highly rigid portion.

  The said vehicle body structure WHEREIN: The said cross member may have a load transmission part extended to the said side frame diagonally upward toward the back from the said cross member attachment part of the said truss part.

  According to this vehicle body structure, the load transmitted from the side member of the sub frame can be effectively transmitted to the side frame in the cross member.

  In the vehicle body structure, the side member is provided in the vicinity of the second cross member mounting portion disposed behind the truss portion and the second cross member mounting portion, and when a load is applied from the front. A stress concentration portion where stress is concentrated.

  According to this vehicle body structure, when a load from the front is applied to the side member at the time of a vehicle collision, energy can be absorbed by deformation of the connecting portion on the rear side of the cross member together with the stress concentration portion. In addition, the rear connection portion is deformed so that the load is transmitted to the side frame via the upper inclined portion in the first half of the vehicle collision, and then the side member is restrained to the cross member in the second half of the vehicle collision. In other words, the side member does not hinder the deformation of the rear side of the side frame.

  In the vehicle body structure, the side member includes a substantially horizontal front horizontal portion, an intermediate inclined portion extending obliquely downward toward the rear, and a substantially horizontal rear horizontal portion, which are successively formed from the front side. A frame main body, wherein the lower inclined portion is disposed on the intermediate inclined portion of the frame main body, and the stress concentration portion is a boundary portion between the intermediate inclined portion and the rear horizontal portion of the frame main body. There may be.

  According to this vehicle body structure, when the front and rear centers of the frame body are subframes inclined, the boundary between the intermediate inclined portion and the rear horizontal portion can be used as a stress concentration portion.

  According to the present invention, it is possible to accurately transmit a load applied to the subframe at the time of a vehicle collision to the side frame.

1 is a schematic side view of a vehicle body structure showing an embodiment of the present invention. It is a schematic perspective view of a vehicle body structure. It is a schematic bottom view of a vehicle body structure.

  1 to 3 show an embodiment of the present invention. FIG. 1 is a schematic side view of a vehicle body structure, FIG. 2 is a schematic perspective view of the vehicle body structure, and FIG. 3 is a schematic bottom view of the vehicle body structure.

  As shown in FIG. 1, the vehicle body 1 is configured by, for example, collecting panel-like members obtained by press-molding steel plates and joining them by spot welding or the like. The vehicle body 1 includes a pair of left and right side frames 10 extending in the front-rear direction on the front side of the vehicle, a cross member 20 connected to a lower portion of each side frame 10 and extending in the left-right direction, and disposed below the side frame 10 and the cross member 20. And a subframe 50 including a pair of side members 30 extending in the direction. A power unit is mounted on the cross member 20 via an engine mount or the like, and a suspension arm is attached to the subframe 50 via a bush, a bracket or the like.

  As shown in FIG. 1, the side member 30 of the subframe 50 includes a substantially horizontal front horizontal portion A, an intermediate inclined portion B extending obliquely downward toward the rear, and a substantially horizontal rear horizontal portion C. It has a frame body formed continuously in order from the front side. The side member 30 is attached to the side frame 10 at the front horizontal portion A, is attached to the cross member 20 at the rear side of the intermediate inclined portion B and the front side of the rear horizontal portion C, and the rear side of the rear horizontal portion C. Attach to the floor of the car body.

  As shown in FIG. 2, the side member 30 includes a highly rigid portion 31 having a relatively high rigidity and a truss portion 32 disposed behind the highly rigid portion 31. The front side of the highly rigid portion 31 of the side member 30 forms an energy absorbing portion that is crushed when the vehicle collides. The truss portion 32 is divided into an upper inclined portion 33 that extends obliquely upward from the predetermined division position and is connected to the cross member 20, a lower inclined portion 34 that extends obliquely downward from the division position to the rear, and a division. A rear connection portion 35 for connecting the upper inclined portion 33 and the lower inclined portion 34 to the rear of the position. In the present embodiment, the lower inclined portion 34 forms a part of the intermediate inclined portion B of the frame body. In the present embodiment, the high-rigidity portion 31 is a tie-down hook 36.

  As shown in FIG. 3, the side member 30 is attached to a side frame attachment portion 40 for attaching to the side frame 10 disposed in front of the high-rigidity portion 31 and a cross member formed in the truss portion 32. A first cross member mounting portion 43 for this purpose, a cross member second mounting portion 44 disposed behind the truss portion 32, and a cross member second mounting portion 44 are provided in the vicinity of the load. And a stress concentration portion 39 where stress is concentrated. As shown in FIG. 1, in the present embodiment, the stress concentration portion 39 is a boundary portion between the intermediate inclined portion B and the rear horizontal portion C in the frame body.

  As shown in FIG. 1, the cross member 20 includes a load transmitting portion 21 that extends obliquely upward from the first cross member mounting portion 43 of the truss portion 32 to the side frame 10, and a cross member behind the truss portion 32. And a vertically extending portion 22 extending upward from the second mounting portion 44 to the side frame 10.

  As shown in FIG. 3, the frame main body of the side member 30 has a front side front / rear extension D extending in the front / rear direction, a slanted extension E extending rearward and leftward / backward in the plan view, and the front / rear direction. An extending rear side front and rear extending portion F is continuously formed in order from the front side. The side member 30 includes a side frame mounting portion 40 disposed on the front end side of the frame body, a floor first mounting portion 41 and a floor second mounting portion 42 disposed on the rear end side of the frame body, and a cross member. It is fixed by a first cross member mounting portion 43 and a cross member second mounting portion 44 disposed below the member 20.

  As shown in FIG. 3, the side frame attachment portion 40 is disposed in front of the high-rigidity portion 31. In the present embodiment, the side frame attachment portion 40 is disposed in the front side front-rear extension portion D and is disposed in the vicinity of the front end of the side member 30. The first cross member mounting portion 43 is formed in the truss portion 32 so as to correspond to the load transmitting portion 21 of the cross member 20. The second cross member mounting portion 44 is formed behind the truss portion 32 so as to correspond to the vertically extending portion 22 of the cross member 20.

  As shown in FIG. 2, the side member 30 includes a low-rigidity portion 37 that is disposed in front of the high-rigidity portion 31 and has relatively low rigidity. In the present embodiment, the low-rigidity portion 37 is configured by a divided portion 38a obtained by dividing a bead 38 extending in the front-rear direction. The low rigidity portion 37 is disposed at a boundary portion between the front horizontal portion A and the intermediate inclined portion B in the frame body.

  In the vehicle body structure configured as described above, by providing the high-rigidity portion 31 and the truss portion 32, the rigidity of the connection portion of the side member 30 of the subframe 50 with the cross member 20 and the vicinity of the front side thereof is improved. As a result, when a load is applied from the front in the event of a vehicle collision or the like, deformation of the side member 30 at the connection portion with the cross member 20 and the deformation in the vicinity of the front member 30 is suppressed even while the front energy absorbing portion is crushed. Is done. Here, in this embodiment, since the tie-down hook is used as the high-rigidity portion 31, it is not necessary to provide the side member 30 with a special structure for locally increasing the rigidity.

  Since the upper inclined portion 33 of the truss portion 32 extends obliquely upward from the division position toward the cross member 20, the load applied to the subframe 50 from the front is passed through the upper inclined portion 33 through the cross member 20. And it can transmit to the side frame 10 reliably. In particular, in the present embodiment, the cross member 20 includes the load transmitting portion 21 extending from the first cross member mounting portion 43 of the side member 30 toward the side frame 10. It is possible to effectively transmit the load transmitted from the side frame 10 to the side frame 10.

  In addition, by actively deforming the low-rigidity portion 37 at the initial stage of the vehicle collision, the energy absorption amount at the initial stage of the vehicle collision can be increased. Further, by buckling the side member 30 with the low-rigidity portion 37 at the initial stage of the vehicle collision, it is possible to maintain the position of the side member 30 where the side member 30 is connected to the cross member 20 and the vicinity of the front portion. Therefore, even after the energy absorbing portion of the side member 30 is deformed in the initial stage of the vehicle collision, the load applied to the subframe 50 from the front can be continuously transmitted to the cross member 20 and the side frame 10 via the upper inclined portion 33. it can.

  Since the low-rigidity portion 37 is disposed at the boundary portion between the front horizontal portion A and the intermediate inclined portion B, the front horizontal portion at the time of a vehicle collision can be obtained even in the subframe 50 in which the front and rear centers of the frame bodies of the side members 30 are inclined. It can be buckled at the boundary between A and the intermediate inclined portion B, and the mode at the time of collision can be controlled accurately.

  Further, since the side frame mounting portion 40 is disposed in the vicinity of the front end of the side member 30, the vicinity of the front end of the side member 30 is accurately supported, and the load applied to the side member 30 in the initial stage of the vehicle collision is applied to the rear side of the side frame 10. Energy absorption at the rear side of the side frame 10 from the first half when the vehicle collides. Furthermore, since the side frame attachment portion 40 is disposed in the front side front-rear extension portion D, a load is applied directly from the side frame attachment portion 40 to the relatively weak oblique extension portion E in the event of a vehicle collision. Absent.

  Further, when a load from the front is applied to the side member 30 at the time of a vehicle collision, energy absorption can be achieved by deforming the vertically extending portion 22 of the cross member 20 together with the stress concentration portion 39 of the side member 30. In the present embodiment, the stress concentration portion 39 is disposed at the boundary portion between the intermediate inclined portion B and the rear horizontal portion C in the frame main body, and the intermediate inclined portion is formed when the front and rear center of the frame main body is the inclined side member 30. The boundary portion between B and the rear horizontal portion C can be used as the stress concentration portion 39. Further, when the vertical extending portion 22 is deformed, the load is transmitted to the side frame 10 side via the upper inclined portion 33 in the first half of the vehicle collision, and then the side member 30 is moved to the cross member 20 side in the second half of the vehicle collision. The side member 30 does not impede deformation of the rear side of the side frame 10.

  While the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. In addition, it should be noted that not all the combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

DESCRIPTION OF SYMBOLS 1 Car body 10 Side frame 20 Cross member 30 Side member 31 High rigidity part 32 Truss part 33 Upper inclination part 34 Lower inclination part 35 Back connection part 36 Tie down hook 37 Low rigidity part 39 Stress concentration part 40 Side frame attachment part 43 First mounting part for cross member 44 Second mounting part for cross member 50 Subframe

Claims (9)

A pair of left and right side frames extending in the front-rear direction;
A cross member connected to a lower portion of each side frame and extending in the left-right direction;
A subframe having a pair of side members disposed below the side frame and the cross member and extending in the front-rear direction;
The side member includes an energy absorbing portion that is crushed in the event of a vehicle collision, a highly rigid portion that is disposed behind the energy absorbing portion and has relatively high rigidity, and a truss portion that is disposed behind the highly rigid portion. And
The truss portion extends obliquely upward from a predetermined division position to the rear and is connected to the cross member, a lower inclination portion obliquely downward from the division position to the rear, and the division A rear connection part that connects the upper slope part and the lower slope part behind the position, and
The side member is further attached to the side frame disposed in front of the high-rigidity part, and to a cross member to be attached to the cross member formed in the truss part. A vehicle body structure having a mounting portion.   The vehicle body structure according to claim 1, wherein the side member includes a low-rigidity portion that is disposed in front of the high-rigidity portion and has relatively low rigidity. The side member has a frame body in which a substantially horizontal front horizontal portion, an intermediate inclined portion extending obliquely downward toward the rear, and a substantially horizontal rear horizontal portion are successively formed in order from the front side. ,
The low-rigidity portion is disposed at a boundary portion between the front horizontal portion and the intermediate inclined portion in the frame body,
The vehicle body structure according to claim 1, wherein the lower divided portion forms a part of the intermediate inclined portion of the frame main body.   The vehicle body structure according to any one of claims 1 to 3, wherein the side frame attachment portion of the side member is disposed in the vicinity of a front end of the side member. The side member includes a front side front and rear extension portion extending in the front-rear direction, a diagonally extended portion extending rearward and leftward and a rear side front and rear extension portion extending in the front-rear direction from the front side. It has a frame body that is continuously formed in order,
The vehicle body structure according to any one of claims 1 to 4, wherein the side frame attachment portion of the side member is disposed in the front side front-rear extension portion.   The vehicle body structure according to claim 1, wherein the high-rigidity portion of the side member is a tie-down hook.   7. The vehicle body structure according to claim 1, wherein the cross member includes a load transmission portion that extends from the cross member mounting portion of the truss portion to the side frame obliquely upward toward the rear.   The side member is provided in the vicinity of the second cross member mounting portion disposed behind the truss portion and the second cross member mounting portion, and stress is concentrated when a load is applied from the front. The vehicle body structure according to claim 1, further comprising a stress concentration portion. The side member has a frame body in which a substantially horizontal front horizontal portion, an intermediate inclined portion extending obliquely downward toward the rear, and a substantially horizontal rear horizontal portion are successively formed in order from the front side. ,
The lower inclined portion is disposed on the intermediate inclined portion of the frame body,
The vehicle body structure according to claim 8, wherein the stress concentration portion is a boundary portion between the intermediate inclined portion and the rear horizontal portion in the frame main body.

Images